rs1553177448

Positions:

• chr1-17024081-G-GGGGAGAAAAGA

Variant summary

Our verdict is Likely benign. Variant got -6 ACMG points: 2P and 8B. PM2 BP6_Very_Strong

The NM_003000.3(SDHB):​c.541-8_541-7insTCTTTTCTCCC variant causes a splice region, splice polypyrimidine tract, intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000414 in 1,449,532 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Likely benign (★★).

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 0.0000041 (0 hom.)
• Consequence: SDHB NM_003000.3 splice_region, splice_polypyrimidine_tract, intron
• Clinical Significance: Likely benign criteria provided, multiple submitters, no conflicts B:2
• Conservation: PhyloP100: -0.172

Genes affected

SDHB (HGNC:10681): (succinate dehydrogenase complex iron sulfur subunit B) This tumor suppressor gene encodes the iron-sulfur protein subunit of the succinate dehydrogenase (SDH) enzyme complex which plays a critical role in mitochondria. The SDH enzyme complex is composed of four nuclear-encoded subunits. This enzyme complex converts succinate to fumarate which releases electrons as part of the citric acid cycle, and the enzyme complex additionally provides an attachment site for released electrons to be transferred to the oxidative phosphorylation pathway. The SDH enzyme complex plays a role in oxygen-related gene regulation through its conversion of succinate, which is an oxygen sensor that stabilizes the hypoxia-inducible factor 1 (HIF1) transcription factor. Sporadic and familial mutations in this gene result in paragangliomas, pheochromocytoma, and gastrointestinal stromal tumors, supporting a link between mitochondrial dysfunction and tumorigenesis. Mutations in this gene are also implicated in nuclear type 4 mitochondrial complex II deficiency. [provided by RefSeq, Jun 2022]

ACMG classification

Verdict is Likely_benign. Variant got -6 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP6: Variant 1-17024081-G-GGGGAGAAAAGA is Benign according to our data. Variant chr1-17024081-G-GGGGAGAAAAGA is described in ClinVar as [Likely_benign]. Clinvar id is 459155.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
SDHB	NM_003000.3	c.541-8_541-7insTCTTTTCTCCC		splice_region_variant, splice_polypyrimidine_tract_variant, intron_variant		ENST00000375499.8
SDHB	NM_001407361.1	c.487-8_487-7insTCTTTTCTCCC		splice_region_variant, splice_polypyrimidine_tract_variant, intron_variant

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
SDHB	ENST00000375499.8	c.541-8_541-7insTCTTTTCTCCC		splice_region_variant, splice_polypyrimidine_tract_variant, intron_variant		1	NM_003000.3	P1
SDHB	ENST00000463045.3	c.370-8_370-7insTCTTTTCTCCC		splice_region_variant, splice_polypyrimidine_tract_variant, intron_variant		3
SDHB	ENST00000491274.6	c.499-8_499-7insTCTTTTCTCCC		splice_region_variant, splice_polypyrimidine_tract_variant, intron_variant		5
SDHB	ENST00000485515.5	n.475-8_475-7insTCTTTTCTCCC		splice_region_variant, splice_polypyrimidine_tract_variant, intron_variant, non_coding_transcript_variant		5

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome AF: 0.00000414 AC: 6 AN: 1449532 Hom.: 0 Cov.: 28 AF XY: 0.00000693 AC XY: 5 AN XY: 721810

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00000544

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 33

Bravo AF: 0.0000113

ClinVar

Significance: Likely benign

Submissions summary: Benign:2

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Pheochromocytoma;C0238198:Gastrointestinal stromal tumor;C1861848:Paragangliomas 4 Benign:1

Likely benign, criteria provided, single submitter

clinical testing

Invitae

Oct 16, 2023

- -

Hereditary pheochromocytoma-paraganglioma Benign:1

Likely benign, criteria provided, single submitter

clinical testing

All of Us Research Program, National Institutes of Health

Dec 27, 2022

- -

Computational scores

Source: dbNSFP v4.3

Splicing

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

LitVar

Other links and lift over

dbSNP: rs1553177448; hg19: chr1-17350576;